Double Eccentric Butterfly Valve: Sealing and Flow Performance Analysis

This research investigates the sealing and flow characteristics of a double eccentric butterfly valve using theoretical analysis, finite element calculations, and CFD simulations. The study explores the contact pressure distribution of the sealing torus, analyzed by polynomial fitting curves, to understand the contact pressure distribution law. It also analyzes the relationship between the closing angle and the rotation distance to avoid the sealing ring from leaving the seat sealing surface area, which could cause leakage. This analysis ensures that the valve effectively seals. Additionally, the effect of different parameters, such as torque, sealing ring material, and geometry, on the sealing performance of the valve was analyzed. The results showed that increasing torque can improve the sealing performance, while the material and geometry of the sealing ring have a significant impact on the sealing performance.

Furthermore, the flow characteristics of the double eccentric butterfly valve were analyzed using computational fluid dynamics (CFD) simulations. The results showed that the valve had a good flow characteristic with low pressure loss and uniform flow distribution. The flow coefficient and flow resistance coefficient were also calculated to evaluate the flow performance of the valve.

Overall, the theoretical analysis, finite element calculation, and CFD simulations provided a comprehensive understanding of the sealing and flow performance of the double eccentric butterfly valve. These insights can guide the design and optimization of the valve for better performance and reliability.